My estimate for GISS's global temperature anomaly for April is +0.66°C.
This is based on the daily reanalysis numbers published by the University of Maine Climate Reanalyzer, as described here. This makes April significantly cooler than March's +0.84°C, but it's still the 4th-warmest April since record-keeping began in 1880.
Year-to-date, i.e. for [only] he first four months of this year, this puts GISS at +0.13°C warmer than 2014. Assuming my estimate for April is correct, GISS only needs an average anomaly of +0.63°C for the rest of the year to establish a new record:
Reminder: GISS's baseline is 1951-1980.
I also estimate HadSST's April anomaly will be +0.40°C, which is the 4th-warmest April since 1850.
The Reanalyzer shows the El Nino really gaining steam (so to speak), which suggests a likelihood of warmer months ahead: